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A 90-MS/s 11-MHz-Bandwidth 62-dB SNDR Noise-Shaping SAR ADC

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2 Author(s)
Fredenburg, J.A. ; Univ. of Michigan, Ann Arbor, MI, USA ; Flynn, M.P.

Although charge-redistribution successive approximation (SAR) ADCs are highly efficient, comparator noise and other effects limit the most efficient operation to below 10-b ENOB. This work introduces an oversampling, noise-shaping SAR ADC architecture that achieves 10-b ENOB with an 8-b SAR DAC array. A noise-shaping scheme shapes both comparator noise and quantization noise, thereby decoupling comparator noise from ADC performance. The loop filter is comprised of a cascade of a two-tap charge-domain FIR filter and an integrator to achieve good noise shaping even with a low-quality integrator. The prototype ADC is fabricated in 65-nm CMOS and occupies a core area of 0.03 mm2. Operating at 90 MS/s, it consumes 806 μW from a 1.2-V supply.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 12 )